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input expression as a variable. [message #50621]

Fri, 06 October 2006 13:12

queiny
Messages: 15
Registered: November 2005

Junior Member

Hi,

May I read in an expression and then used it in the 'IF' or 'WHILE' or
'CASE'?

For example, may I define the expression first, then use it? Or read in
expressions from standard input or input files?

expr1=' a gt 3'

if(expr1) then do begin
******
endif

It seems if I define 'expr1' as a string, and it is always true.. What
type should it be?

May I use something like:

readf, in_unit, expr1

or

readf, expr1, prompt='Enter Condition:'

so, the 'expr1' can be defined more flexiable.

Thanks

Q

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